More and more complex and faster operation frequences lead to higher demands of personalsafety for machines and devices. The fundamental obligation to take the necessary precautions are laid down in different laws. This requires partly different and partly the same safety measures. The SSZ-safety units are made to protect you from dangerous movements. SSZ-safety switching rails, SSZ-safety mats and SSZ-safety bumpers are safety systems that through the influence of some activity in cooperation with an electronic controler, produce a control command. Usually this is a stop command. Protection of dangers and dangerous areas is given in this way.